School of Chemical Engineering, Chonbuk National University, Jeonbuk 561-756, Republic of Korea.
School of Chemical Engineering, Chonbuk National University, Jeonbuk 561-756, Republic of Korea; Department of Bioprocess Engineering, Chonbuk National University, Jeonbuk 561-756, Republic of Korea.
J Hazard Mater. 2015;283:657-62. doi: 10.1016/j.jhazmat.2014.10.008. Epub 2014 Oct 15.
This study reports a new finding that the industrial waste biomass of Escherichia coli is capable of selective binding of Pd(II) in the Pd(II)-Pt(IV) bimetal solution. Batch sorption experiments with E. coli were carried out at different initial metal concentrations in single and bimetal systems. In the single metal systems, the maximum sorption capacities of E. coli for Pt(IV) and Pd(II) were found to be 45.65 ± 2.04 and 38.87 ± 2.08 mg/g, respectively. Meanwhile, in the bimetal system, the maximum sorption capacities for Pd(II) and Pt(IV) were 33.16 ± 1.53 and 7.32 ± 0.29 mg/g, respectively, which corresponded to 4.53 times of selective adsorption toward Pd(II). In order to understand the underlying reason, ion exchange resins (TP214 and Amberjet 4200) with different amine types were compared with the E. coli biomass. As a result, it was found that the sorbents containing primary amine groups could selectively adsorb Pd(II) more easily in the binary mixture.
本研究报告了一个新发现，即大肠杆菌的工业废生物质能够在 Pd(II)-Pt(IV) 双金属溶液中选择性结合 Pd(II)。在单金属和双金属体系中，进行了不同初始金属浓度下大肠杆菌的批量吸附实验。在单金属体系中，大肠杆菌对 Pt(IV)和 Pd(II)的最大吸附容量分别为 45.65±2.04 和 38.87±2.08mg/g。同时，在双金属体系中，大肠杆菌对 Pd(II)和 Pt(IV)的最大吸附容量分别为 33.16±1.53 和 7.32±0.29mg/g，这对应于对 Pd(II)的选择性吸附提高了 4.53 倍。为了理解这一现象的根本原因，我们比较了具有不同胺类型的离子交换树脂（TP214 和 Amberjet 4200）与大肠杆菌生物质的性能。结果表明，含有伯胺基团的吸附剂在二元混合物中更容易选择性地吸附 Pd(II)。
